class A {
	public int getNumber(int a) {
		return a+1;
	}
}
class B extends A {
	public int getNumber (int a) {
		return a+100;
	}
	public static void main(String args[]) {
		A a=new A();
		System.out.println(a.getNumber(10));  //【代码1】
		a = new B();
		System.out.println(a.getNumber(10));  //【代码2】
	}
}
		
